Internal energy does not include

You are given the following two reactions:

$\left(\mathrm{i}\right) {\mathrm{CH}}_{4 \left(\mathrm{g}\right)}+2{\mathrm{O}}_{2 \left(\mathrm{g}\right)}\to {\mathrm{CO}}_{2 \left(\mathrm{g}\right)} +2{\mathrm{H}}_2{\mathrm{O}}_{ \left(\mathrm{l}\right)}; ∆\mathrm{H}=-890.4 \mathrm{kJ}$

$\left(\mathrm{ii}\right) 2{\mathrm{H}}_2{\mathrm{O}}_{ \left(\mathrm{g}\right)} \to 2{\mathrm{H}}_{2 \left(\mathrm{g}\right)} +{\mathrm{O}}_{2 \left(\mathrm{g}\right)}; ∆\mathrm{H}=+76.0 \mathrm{kJ}$

Which one of the following statements is correct?

The enthalpy of formation of ammonia is $-46.0 \mathrm{kJ} {\mathrm{mol}}^{-1}.$ The enthalpy change for the reaction $4{\mathrm{NH}}_3\left(\mathrm{g}\right)\to 2{\mathrm{N}}_2\left(\mathrm{g}\right)+6{\mathrm{H}}_2\left(\mathrm{g}\right)$ is

The maximum work obtained from an isothermal reversible expansion of $1 \mathrm{mole}$ of an ideal gas from $2.24 \mathrm{L} \text{to} 22.4 \mathrm{L} \text{is}$

$\left(\mathrm{R}=2 \mathrm{cal} {\mathrm{K}}^{-1}{\mathrm{mol}}^{-1}, \mathrm{T}={27}^{ \circ }\mathrm{C}\right)$